Acceleration of gravity for a ball thrown upward and downward

Assume that the acceleration of gravity is 10 m/s2 downward, and
that all friction effects can be neglected. A ball is thrown upward
at a velocity of 20 m/s. What is its velocity at t = 2 s?
zero

a. 10 m/s upward
b. 10 m/s downward
c. 20 m/s downward
d. 20 m/s upward

Assume that the acceleration of gravity is 10 m/s2 downward, and
that all friction effects can be neglected. A ball is thrown upward
at a velocity of 20 m/s. What is its velocity at t = 3 s?
zero

a. m/s upward
b. 10 m/s downward
c. 20 m/s downward
d. 20 m/s upward

Solution Preview

Vf = Vi + at

Vf = final velocity
Vi = initial velocity
a = ...

Solution Summary

With clear calculations and explanations, the problems are solved.

A moon rock is thrownupward with an initial velocity of 5.0m/s. After 5.0s it has a downward velocity of 3.0m/s
a) What is the acceleration due to gravity on the Moon?
b) How high above the starting point did the rock go before it began to fall?
c) How high would the same rock rise above the earth's surface if it is thrown

A ball is thrown vertically upward with an initial speed of 22 m/s. Then, 0.67s later, a stone is thrown straight up (from the same initial height as the ball) with an initial speed of 37 m/s.
How far above the release point with the balland stone pass each other? The acceleration of gravity is 9.8 m/s^2.
Answer in units

1. A ball is thrown vertically upward with a speed of 23.3 m/s.
a) How long does it take to reach its highest point?
b) What is its velocity when it returns to the level from which it started?
2. A ballthrown vertically upward is caught by the thrower after 2.9 s. The acceleration of gravity is 9.8 m/s
a) Find

A ball is thrown directly downward, with an initial speed of 8.50 m/s, from a height of 31.0 m. After what time interval does the ball strike the ground?

On planet Tehar, the acceleration of gravity is the same as that on Earth but there is also a strong downward electric field with the field being uniform close to the planet's surface. A 1.50 kg ball having a charge of 5.38 uC is thrownupward at a speed of 20.7 m/s and it hits the ground after an interval of 3.74 s. What is the

Suppose you throw a baseball straight up at a velocity of 64 feet per second. A function can be created by expressing distance above the ground, s, as a function of time, t. This function is s = -16t2 + v0t + s0
· 16 represents 1/2g, the gravitational pull due to gravity (measured in feet per second2).
· v0 is the initial

This is an An interesting problem to understand the vertical upward or downward motion conceptualy. Do you know how to apply kinematical equations to the vertical motion? Are you sared of solving tough problems on kinematical euqaions of motion? Don't worry, solving one such problem or properly understanding its solution will de

1. Balls A, B, and C all start at the same height above the ground. Ball A is dropped. Ball B is thrown horizonatally to the right at 5 m/s. Ball C is thrown horizontally to the left at 15 m/s. What is the order that they hit ground and why?
2. Explain why, when traveling in a circle, the acceleration is toward the center of

A cylindrical beaker of height 0.100m and negligible weight is filled to the brim with a fluid of density = 890kg/m^3 . When the beaker is placed on a scale, its weight is measured to be 1.00N.
A ball of density = 5000kg/m^3 and volume = 60.0cm^3 is then submerged in the fluid, so that some of the fluid spills over the side